The MIH61 monoclonal antibody specifically binds to TLT-2 (TREM-like transcript 2 protein) which is also known as TREML2 (Triggering receptor expressed on myeloid cells-like 2). TLT-2 is a 33 kDa type I transmembrane protein that belongs to the TREM family. It consists of a single extra-cellular Ig-like V-type domain, a transmembrane segment and a cytoplasmic tail. TLT-2 is expressed on B cells, granulocytes, monocytes/macrophages and a fraction of peripheral blood T cells. TLT-2 expression on neutrophils and macrophage is reportedly upregulated in response to inflammatory conditions in vivo. TLT-2 plays important roles in innate and adaptive immunity. It acts as an engulfment receptor for apoptotic cells and can enhance the activation of T cells. The MIH61 antibody reportedly does not recognize mouse TLT-2.
The antibody was conjugated to BD Horizon™ BUV737 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 with an Ex Max of 348-nm and an acceptor dye with an Em Max at 737-nm. BD Horizon Brilliant BUV737 can be excited by the ultraviolet laser (355 nm) and detected with a 740/35 filter. Due to the excitation of the acceptor dye by other laser lines, there may be significant spillover into channels detecting Alexa Fluor® 700-like dyes (eg, 712/20-nm filter).
Due to spectral differences between labeled cells and beads, using BD™ CompBeads can result in incorrect spillover values when used with BD Horizon BUV737 reagents. Therefore, the use of BD CompBeads or BD CompBeads Plus to determine spillover values for these reagents is not recommended. Different BUV737 reagents (eg, CD4 vs. CD45) can have slightly different fluorescence spillover therefore, it may also be necessary to use clone specific compensation controls when using these reagents.